feat(game): implement proper barrier detection logic

[PresenceOP-Coder]

Description

This pull request implements the barrier movement, collision detection, and scoring mechanics for the Flappy Bird game.
Changes include:

• Smooth and continuous barrier movement from right to left (0.05 units per frame)
• Automatic barrier repositioning when off-screen (x < -1.5 → x = 1.5)
• Dual barrier setup with proper spacing (barrierx1, barrierx2)
• Collision detection between the bird and barriers
• Scoring system that increments when barriers pass the bird
• Real-time state updates integrated with the main game loop

Semver Changes

• Patch (bug fix, no new features)
• Minor (new features, no breaking changes)
• Major (breaking changes)

Issues

Closes #7

Checklist

• I have read the Contributing Guidelines.